Method of and tension regulating device for tight twisting of threads

ABSTRACT

A method of and a tension-regulating device for the tighttwizting of a pair of non-twisting threads unwound from a bobbin or yarn package, wherein the threads are passed without twisting through a hollow spindle, are wound one or more times around an arm of the tension-regulating device and are then passed through the eye thereof. Within the spindle, the threads are stretched and are length -equalized, the twisting being effected by the eye and a pair of drawing rollers feeding the twisted yarn to a yarn package or bobbin upon which it is wound.

United States Patent 11 1 Petrov 14 1 Jul 17, 1973 METHOD OF ANDTENSlON-REGULATING DEVICE FOR TIGHT-TWISTING OF THREADS [75] Inventor:Gueorgui Mitov Petrov, Sofia,

Bulgaria [73] Assignee: BTR Pamukotec Botevgradsko Chaussee, Sofia,Bulgaria [22] Filed: Oct. 26, 1970 211 Appl. No.: 83,972

[30] Foreign Application Priority Data Nov. 1, 1969 Bulgaria 13282 [52]US. Cl. 57/59, 57/58.86 [51] Int. Cl D0lh 7/02 [58] Field of Search57/34 R, 58.49, 58.52,

[56] References Cited UNITED STATES PATENTS 3,369,858 3/1967 Franzen57/58.86

2,847,817 8/1958 Gonsalves 57/62 2,843,998 7/1958 Schlums 57 592,946,176 7/1960 Higgins 57/62 2,238,203 4 1941 Wylde et al 57 59FOREIGN PATENTS OR APPLICATIONS l,485,743 5/1967 France 57 59 PrimaryExaminer-Donald E. Watkins Attorney-Karl F. Ross [57] ABSTRACT A methodof and a tension-regulating device for the tighttwizting of a pair ofnon-twisting threads unwound from a bobbin or yarn package, wherein thethreads are passed without twisting through a hollow spindle, are woundone or more times around an arm of the tensionregulating device and arethen passed through the eye thereof. Within the spindle, the threads arestretched and are length -'equalized, the twisting being effected by theeye and a pair of drawing rollers feeding the twisted yarn to a yarnpackageor bobbin upon which it is wound.

4 Claims, 3 Drawing Figures Gueorgui M. Pefrov INVENTOR BY S S Q- EAttorney METHOD OF AND TENSION-REGULATING DEVICE FOR TIGHT-TWISTINGOFTHREADS FIELD OF THE INVENTION The invention relates to a method oftight-twisting a straight stretch of previously nontwisted threads bymeans of a hollow spindle and a tension regulator or limiter.

Background of the Invention A method of and a device for thetight-twisting of twisted and wound up as yarn packages. This is ashortcoming of the prior-art method. Furthermore, the device is providedwith decelerating sleeves having difierent coefficients of friction,according to the different twists and thicknesses of the yarns.

Another method and device are known in the prior art, wherein thethreads are not previously twisted at all. The nontwisted threadsunwound from the yarn package pass separately through yarn guides,rotatably mounted at the inlet of the hollow spindle. The threadspassing through the hollow spindle are decelerated in a channel formedat the outlet of this hollow spindle. The threads receive a tight-twistand are wound up. The shortcoming of the method is that the threads mustpass through guides. Furthermore a small baloon is formed by thenon-twisted threads immediately beyond the point at which thedeceleration occurs.

OBJECTS OF THE INVENTION The main object of the invention is to use thewhole length of the hollow spindle for a preliminary equalizing of thetensile stresses in the nontwisted threads.

Another object of the invention is to locate the point at which thedeceleration of the threads occurs, in such a manner at the outlet ofthe hollow spindle, that it coincides with the geometrical axis of thespindle.

SUMMARY OF THE INVENTION In accordance with the invention, thenontwisted threads are unwound separately from the yarn package fixed ona hollow spindle. After the passage of the nontwisted threads throughthe hollow spindle they are decelerated by a tension regulating limitermounted at the discharge side of the hollow spindle and are tighttwistedby the rotary motion of the spindle. In such manner the entire twistingprocess is divided into two sections, zones or stretches The firstsection zone or stretch extends from the unwinding point of thenontwisted threads on the yarn package to the tension regulating limitermeans. In this first section, zone or stretch the threads remainuntwisted. Because of the free untwisted passage of the threads throughthe hollow spindle, the tension threads reach the regulating limiterwith-equalized lengths. The second section, zone or stretch extendsbetween the regulating limiter means and the guide means provided toguide the twisted threads toward the wind-up or takeup winding on means.In this second section ,zone or stretch the tension regulating limiterfixed-at the discharge end of the hollow spindle in such manner that anaye provided thereon is aligned with the geometrical axis of the hollowspindle, transmits the rotary motion of the hollow spindle to thethreads. 'Thus the threads are tighttwisted. At the same time thetension regulating limiter adjusts the tension of thenontwisted threadsand provides some stretching andequalizing of the structure of thenontwisted threads.

' DESCRIPTION OF THE DRAWING For a better understanding of the inventionand to show how the same may be carried into effect, reference is nowmade to the accompanying drawing in which FIG. I shows a shematicdiagram of a device embodying the invention FIG. 2 is a side elevationof the tension regulating limiter shown in FIG. 1; and

FIG. 3 is a top plan view of the tension regulating limiter.

SPECIFIC DESCRIPTION The threads are then passed around the arm 12 of atension regulating limiter 8 and reach the receiving bobbin 10 throughthe drawing roller pair 9. The nontwisted threads are wound around thearm 12 of the tension regulating limiter 8 as many times as is requiredfor increased tension in the section, stretch or zone of the formationof the twists. The twist rate is determined by the number of revolutionsof the hollow spindle 1 and by the drawing velocity of the pair ofrollers 9. The deceleration of the threads through the tensionregulating limiter 8 avoids a back transmission of twists to the sectionbetween the tension regulating limiter 8 and the unwinding point on thebobbin 3. The threads unwound off from the bobbin form separate baloon 6before entering the inlet opening 5, and because of the smaller drag inthe cavity of the spindle the threads are stretched and their lengthsequalized before entering the section of the formation of twists.

As shown in FIGS. 2 and 3, the tension regulating limiter 8 comprises anarm 12, a spiral shaped open eye 13 and a spring sleeve 11. The axis ofthe spiral shaped open eye 13 identified to in FIG. 3 with the numeral15 is perpendicular to the axis 16 of the spindle. The nontwistedthreads are wound around the arm 12 and then pass through the eye 13.The threads thus follow the direction of the axis 16, so that no baloonis formed immediately after the regulating limiter 8.

What we claim is:

l. A device for the twisting of a pair of threads on a yarn package,comprising a hollow spindle having an axis; means for receiving saidyarn package and rotating same and said spindle concurrently about saidaxis, said threads being unwound from said yarn package and passingthrough said spindle; a tension-regulating limiter mounted at an end ofsaid spindle and having a spring sleeve surrounding said end of saidspindle, an

arm extending generally in the direction of said axis from said sleeve,and a generally spiral shaped eye at the end of said arm, said threadspassing over said arm and through said eye upon emerging from saidspindle; and means spaced from said eye for receiving the threadstwisted between said eye and the last men tioned means.

2. The device defined in claim 1 wherein said eye has an axisintersectiing the axis of said spindle.

3. The device defined in claim 2 wherein said axis of said eye isperpendicular to the axis of said spindle.

4. A method of tight-twisting a pair of threads wound upon a yarnpackage without twisting, said method comprising the steps of:

a. unwinding said threads jointly from said yarn package and passingthem through a hollow spindle said threads between said eye and saidlocation.

i I i fi

1. A device for the twisting of a pair of threads on a yarn package,comprising a hollow spindle having an axis; means for receiving saidyarn package and rotating same and said spindle concurrently about saidaxis, said threads being unwound from said yarn package and passingthrough said spindle; a tensionregulating limiter mounted at an end ofsaid spindle and having a spring sleeve surrounding said end of saidspindle, an arm extending generally in the direction of said axis fromsaid sleeve, and a generally spiral shaped eye at the end of said arm,said threads passing over said arm and through said eye upon emergingfrom said spindle; and means spaced from said eye for receiving thethreads twisted between said eye and the last mentioned means.
 2. Thedevice defineD in claim 1 wherein said eye has an axis intersectiing theaxis of said spindle.
 3. The device defined in claim 2 wherein said axisof said eye is perpendicular to the axis of said spindle.
 4. A method oftight-twisting a pair of threads wound upon a yarn package withouttwisting, said method comprising the steps of: a. unwinding said threadsjointly from said yarn package and passing them through a hollow spindlewithout imparting a twist to said threads therein while stretching andlength-equalizing said threads within said hollow spindle; b.frictionally engaging said threads by passing them jointly over an armof a tension-regulating limiter and through an eye thereof uponemergence of said threads from said hollow spindle; c. gripping saidthreads at a location spaced from said eye and drawing said threadsthrough said hollow spindle, along said arm and through said eye fromsaid location; and d. rotating said yarn package, said hollow spindleand said tension-regulating limiter to impart a twist to said threadsbetween said eye and said location.